Machine for hoisting



'UNITED sTATEs PATENT orario W. C. ALLISON, OF PHILADELPHIA,PENNSYLVANIA.

MACHINE FOR HOISTING.

Specification of Letters Patent No. 7,230, dated April 2, 1850.

To all whom t may concern:

Be it known that I, WILLIAM C. ALLIsoN, of the city and county ofPhiladelphia, in the State of Pennsylvania, have invented a new anduseful machine for hoisting or taking up or elevating or for lettingdown' or lowering ice, stone, brick, coal, corn, or any heavy material,liquid as well as solid, to, into, or from or out of any height orelevation, which I have designated by the name of Allisons elevator, andI do hereby declare that the following is a clear, full, and exactdescription of the construction and operation of the same, referencebeing had to the annexed drawings, making a part of this specification,viz:

Four wheels or pulleys A, A, A, A, of metal or of wood bound with metalof any convenient size, and two of them being of the same diameterprecisely with suitable grooves or channels B, B, &c., in the peripheryof each pulley and with points pins or cogs inserted securely in thehollow of each groove at proper distances apart to receive secure andhold in their places two endless chains C, C, with which they are madeto revolve upon their respective aXes D, E, F. One pair of said pulleys(and the smaller of the two if there be any difference in theirdiameters) to be secured each upon its own aXis D, E, upon upright postsGr, I-I, at any required height. above and perpendicularly over theother pair or nearly so. Upon these pulleys the two separate and endlesschains C, C, ofequal lengths are made to run parallel'with each other,each chain being secured upon the peripheries of an upper and a lowerpulley by means of the grooves and points or cogs above mentioned. Thetwo lower pulleys being secured upon the same aXle F at any requireddistance asunder and the two upper ones upon separate and independentaxles D, E, at the same distance asunder as the lower ones. The axle ofthe two lower pulleys to be provided at one or both ends with a crank I,or with the necessary gearing for the application of steam or horse orother power, sets of buckets, tubs, platforms or hooks or whatever elsemay be most suitable for containing, holding or receiving the materialor weight to be hoisted or lowered are to be attached by arms or hooksK, K, &c., as shown in the drawing to the chains at equal distances atL, L, &c., vso as to hang freely and swing between them, into whichbuckets or tubs the material or weight to be hoisted or lowered isdeposited, power being then applied to the crank a rotary motion will becommunicated to the lower pair of pulleys whereby the chains will be setin` motion. Through these motion will be communicated to the upper pairof pulleys and the tubs or buckets made toV pass up upon the one side ofthe machine and down upon` the other and the material to be hoisted orlet down being put into or upon the fixtures provided for the purposemay be hoisted or let down any height not exceeding that of the machine.

To the machine I attach upon either side of it a movable platform m, m,for holding and receiving the material to be hoisted or let down with arun or way of the necessary length. The one end of the upper-oneterminating at an easy inclination in the storehouse, vessel or inwhatever the material is to be deposited, with an aperture or aperturesat the end att-ached to the machine large enough forthe chains, buckets,Sac.,

to pass through freely with guides attached to prevent the bucketsstriking and to keep them steady.

For ice-houses, store-houses, mills and the like this machine may bepermanently at tached to or made a part'of the building. For a portablemachine of the kind there must be a frame work adapted to the purpose.

What I claim as my invention in the above described machine and desireto `secure by Letters Patent is l. The separate and independent action,each upon its own axis, of the two upper pulleys whereby the buckets orweights are suffered to pass freely between them without let orhindrance.

2. And in combination therewith I claim also the swinging of the bucketsor weights between the chains so that they shall always hang downward inwhatever position the parts of the chains to which they are attached maybe.

VVILLIAM C. ALLI SON.

